Sewing-machine attachment



Sept. 8, 1925.

J. J. FENTON SEWING MACHINE ATTACHMENT Filed March 17, 1925 IN VIZNFOR JomvJ Fsnrou BYJMMM 4&6 AITORNLZZ cam against a spring to hold said leg when a'lever mounted on the crosshead and con- I can be placed in an' inoperative Patented Sept. 8, 1925.

PATENT OFFICE.

JOHN J. Eamon, or Montana, err'nnnc, CANADA...

'snwmemacnmn ATTACHMENT. 1

' a plication and March 17,1923. Serial No. 625,858.

To all whom it may concern:

Be it known that 1, JOHN J. Fmt ron, a subject of the King of Great Britainfand resident of the city of -Montreal, in the Province ofQuebec and Dominionof Canada. have invented certain new and useful Improvements in Sewing-Machine Attach- .ments, of which the following is a full, clear andexact description."

This invention relates to new and useful improvements in picot edge cutters for sewing machines, and the object of the invention is to provide a simple, inexpensive and adjustable cutting. mechanism forsewing machines.

Another object is to provide a device which will be :permanently attached to the presser foot and whichwill be easily put" out of action when not required.

In my invention, I provide a crosshead to which'is attached the presser foot, within which operates-a pair of scissors for cutting the material after it has been stitched or hemmed, the whole 'operation being done in one -operation of the machine. The scissors are os'cillatably mounted in the crosshead and one leg is adapted to be operated by a in the operating position. The other leg is hingedly connected to the presser foot and is adapted to be operated by the movement of the piercer bar, through the medium of nected to an extension of the scissors leg. The link, is provided with a slotted connection to allow the length ofthe cut to be adjusted. Thelink' is also provided with an adjustable. sliding connection to the operating lever and is so mounted that the link osition, said link being-placed on the dead centre. The crossheadis securely fixed to the presser .foot bar of the sewing machine and may be slida'bly mounted-in the head of the machine, so that it.can be raised to allow for the insertion of the material to be operated upon.

In the drawings which illustrate the invention;-- p 1 Fig. 1 is a front elevation of the device. Fig. 2 is an end elevation of the cutting mechanism.

Fig. 3 is an elevation of'the sliding conmotion between the operating link and the operating lever.

' Fig. 4 is a plan-view of Figure 3.

Referring more particularly to the drawmgs, 11 designates the head of a sewing machine in which is slidably mounted the presser foot bar 12, the piercer bar 12 and the needle bar 13, which are operated in the well known manner. Attached to the presser foot bar is the crosshead 14 by means of the screw, which engages with the presser foot bar passin through the crosshead aper ture 15. 'Osc' atably mounted on the crosshead are the presser feet 16, the pins 17 passing through both the presser feet and the crosshead. Between the presser feet 16 and 16 the scissor points 18 and 19 oscillate 'about the pin 20 passing throuh the bracket 14 secured to the presser ar 12. The scissors arm 18 is provided with an extension 21, which is yieldably attached by a spring 21' to alug 22 cast integral with the bracket 14. A cam-shaped operating lever '23 is pivotally mounted on the bracket 14 and is provided with a grip 24 for easy operating of the cam. The cam engages with the scissors arm extension 21 and acts in conjunction with the spring to release or put into action the scissors point 18. The scissors point 19 is provided with an operating arm 25, which extends beyond the fulcrumpin 20, and attached thereto is an adjustable link 26, which is made in two parts adjustably connectedtogether bythe slot and screw connection 27 and 28. One

end of the link is pivotally' connected to the arm 25 of the blade 19 and the other end of the link is pivotally connected to the pin 34 which is adjustablymounted in the grooved-guideway 32 of the lever 29. The

operating lever 29 is pivotall mounted in an. extension 14 ,of the brac et 14. One

end of the lever is provided with a slot 30,

the sides of which are in operative -.connec-' tion with the piercer bar, so that on thepivots about the pin 31 passing through the extension 14 The other "end of this lever is slidablyi or adjustably connected 5 to the movement of the said piercer bar the lever link 26 as before mentioned said lever being I provided with a grooved guide '32, within which the head 33 of'the pm .34 slides. A

wing or thumbnut 35 is rovided for the pin 34, so that quick and slmple adjustment can be made and'th'e head 33 moved along the ides. q

Tne operation of the device is as follows he presser foot is raised and the material to be erated upon is placed between it and the ed plate of the machine. The presser foot is then dropped and the machine worked in the well known manner. The scissors point 18 is released by moving the cam-shaped lever 23 and allowing the spring to pull the extension, so that the said thumb nut is loosened and the pin 34 pushed along the guide 32 between the grooves until the centre of the pin 34 coincides with the centre of the pin 31, which is the pivoting centre of the operating lever 29. As this position is reached,-no movement is transmitted to the scissors point 19 or the link 26 and the scissors point 19 is clear of the material.

Slight modification may be made in the construction of the various members of the scissors gear without departing from the spirit of the invention.

To facilitate the working. of the device, an automaticlscissors controlling mechanism is fitted to the cross-head. It has been-found that operators may forget touse the cam for lifting one of the scissors points clear of the material when raising the presser foot and thus material may be torn or damaged. To overcome this difliculty, I provide a bar 35 working in a guide 36 attached to' the presser foot bar. The bar is fittedwith a compression spring 37 between a head 38 and the guide 36. At the other'endof the bar, an adjustable finger 39 is fitted. The

end 40 of the finger .39 is bent inwardly and works in a slide or slot 41 formed in the bracket 1st and engages with the extension of the scissors point 18.

The operation of this mechanism is as follows ;-When the presser foot is raised, the

head 38 engageswith the head N of the sewing machine and presses the bar 35 downwardly, thus bringing'the end 40 of the finger 39 into contact with the scissors point extension 21', and thereby raises said point clear of the base ofthe presser foot, allowing for the easy extraction of material -from the machine When the presser foot is lowered, the bar 35' is raised by the spring 37 and allows the tension spring 21 to bring the scissors point below the presser foot and into the cutting position.

.Having thus described my invention, what I claim is; .d I escribed,

1. In. a device of the character a presser foot bar, a cross-head attachedthereto, presser feet attached to said cross-- head, a bracket attached to the presser foot bar, a pair of scissors pivotally attached tothe bracket and positioned between the presser feet, extensions on I said scissors,

means to hold one of the scissors points in or fixedly out of the cutting position, and means connected to the other part of the scissors to oscillate or hold it in an inoperative position, said means comprising a grooved and slotted, pivotally mounted lever on the bracket, the slotted end to be in engagement with the piercer bar of a sewing machine,vthe other end of the lever slidably connected to the scissors extension, the centre of said slidable. connection to coincide with the pivotlo'f ,the

lever when in the inoperative position.

2. In a'deviceof the character described, a

presser foot bar, a crosshead attached thereto, presser feet attached to said crosshead, a bracket attached to the presser foot bar, a pair of scissors pivotally attached to the bracket and positioned between the presser wfeet,'extensions on said scissors, means to hold one of said scissors points in or fixedly out of the cutting position, means to OSClllit-PG the otherpoint of the scissors-or to hold it 1n the inoperative position, said means comprising a link, alever oscillatably mounted on said bracket, one end-of said lever having a slotted end in engagement with the piercer bar of a sewing machine, the other end of said lever being rovided with a grooved guide, and a largeeaded pin slidably mounted in said guide and through the link, 'so that the pin may be slid into the inoperative position with its centre coinciding with the" centre of the'pivot ofthe lever.

3. In a device of the character described, a presser foot bar, a crosshead attached; thereto, presser feet oscillatably mounted n sald crosshead, a bracket attached to the presser foot bar, a pair of scissor blades, a pin pass? ing through the bracket and the -sc1ssor blades, extensions on the end of said scissor blades, a lug on the'upper part of the bracket, a tension spring connection between one I of said extensions and the lug, a hand operated cam mounted on said bracket and adaptedto hold one'of said scissor blades in the inoperative position, a link,'a slot in said 1ink, means for securing the link to the other scissor blade extension, a lever .with one end slotted and freel connected to the piercer bar, the other en of said lever being grooved I to form a guide, a pivot pin passing through the lever and the bracket, and a connecting pin for connecting the link and the lever,

sliding in said grooved guide and adapted to .allow the connecting pin centre to coincide with the pivot pin centre when the scissors are m the inoperative position.

4. In a device of he character described, a presser foot bar, a crosshead attached there to, presser feet ,oscillatably mounted in said crosshead, a bracket attached to the presser foot bar, a pair of scissor blades, a pin assing through the bracket and the scissor blades, extensions on the end of said scissor blades, a lug on the upper part of the bracket, a tension spring connection between one of said extensions and the lug, a hand-operated cam mounted on said bracket and adapted to hold the spring-controlled scissors ex- -tension in inoperative position, a link, a slot in said link, means for securing said link to the other scissor blade extension, a lever having one end slotted and freely connected to the piercer bar of a sewing machine, the other end of said lever being grooved to form a guide, a pivot pin passing through the lever andthe bracket, a connecting pin for connecting the link and the lever, sliding in said grooved guide and adapted to allow the connecting pin centre to coincide with the pivot pin centre when the scissors are in the inoperative position, and auto matic means to hold the scissors point above the base of the presser foot when said foot is raised to clear the material.

. 5. A device according to claim 4, in which the automatic means to hold the scissors point above the base of the presser foot comprises a guide attached to the presser foot bar, a headed pin passing through said guide, a compression spring between the guide and pin head, and an adjustable finger attached to said pin and adapted to enga e with one of the scissor blades when t e presser foot is raised and to clear said blade when thepresser foot is lowered.

In witness whereof, I have hereunto set my hand.

- JOHN J. FENTON. 

